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- G. W. BRIGGS.

STOP MOTION FOR STEAM ENGINES.

No. 265,747. Patented"Oct- 10, 1882.

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UNITED STATES PATENT OFFICE.

GEORGE W. BRIGGS, OF DENVER, COLORADO.

STOP-MOTIQN F-OR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 265,747, dated October10, 1882.

7 Application filed May 26,1882.

To all whom it may concern:

Be it known that I, GEORGE W. BRIGGS, a citizen of the United States ofAmerica, residing at Denver, in the county of Arapahoe and State ofColorado, have invented certain new and useful Improvements inStop-Motions for Steam-Engines, 850., of which the following is aspecification, reference being bad therein to the accompanying drawings.

Although adapted for use in other connections, as will be hereinafterexplained, this invention relates more particularly to the stopmotionmechanism of the valve-gear ot'steanlengines.

It consists in interposing a sleeve between a continuously-reciprocatingrod and the device to be reciprocated thereby,in which sleeve the rodmay either reciprocate or to which it may be locked at the proper pointby a locking-cam mounted on the sleeve and adapted to engage a recess inthe rod.

In order that my invention may be clearly understood, 1- haveillustrated in the annexed drawings and will proceed to describe thebest form thereof at present known to me as applied to the valve-gear ofa steam-engine, and also its application to a pump-rod.

Figure 1 is a side elevation of so much of a horizontal reciprocatingengine as will clearly illustrate my improved stop-motion. Fig. 2 is asectionized side elevation of the stop-motion detached. Fig. 3 is a planview of such detached stop-motion. Fig. 4 illustrates the end of theeccentric-rod. Fig. 5 illustrates the application of my invention to apumprod.

The same letters of reference indicate identical parts in all thefigures.

- The use of my invention as a stop-motion I- have illustrated in theannexed drawings in connection with a steam-engine in which thevalve-stem A is operated by the arm 0 of a rock-shaft, I), through aconnecting-rod, B, the rock'shat't D being provided with an arm, E, withwhich the eccentric-rod G can be connected by means of the sleeve orsocket F. The sleeve is constructed with a shank, which is strapped tothe stud-pin of arm E, as clearly shown, so that the sleeve may turn onsaid arm, as required. The end of the eccentricrod is snugly fitted inthe bore of the sleeve, and is adapted to freely slide therein, exceptwhen it is locked thereto by a locking device, which in this instanceconsists of an eccen- (No model.)

tric or cam, H, pivoted to the sleeve opposite to a hole, fitherein,through which hole the cam can be made to enter to engage a notch ordepression, g, in the eccentric-rod. The notch g conforms to the curveof the cam, so that the eccentric-rod will always be locked atthe.proper point to the sleeve, and consequently operate the valve withproper reference to the motion of the piston. The locking-cam H isprovided with a handle, h, for operating it, and a spring-hook, I, maybe fastened to the sleeve, adapted to lock handle it when the cam is inengagement with the eccentric-rod.

In applying my invention to a pump-rod I divide such rod at the properpoint and rigidly secure to or form on one section thereof a socket, K,in the bore of which the adjacent end of the other section, L, of thepump-rod is fitted, so that it may slide freely therein, being notchedlike the eccentric-rod G, and the socket K being provided with alockingcam for locking section L of the pump-rod to the socket K of theother section, all as shown in Fig. 5.

I prefer to use a cam for locking a notched reciprocating rod to thesleeve or socket; but it is obvious that other well-known means may beemployed to detachably look a reciprocating rod to such sleeve or socketat a determinate point without essentially changing the combination.Again, the device for transmitting the motion of the reciprocating rodneed not necessarily be a sleeve or socket, although Ipret'er that. Thissocket and cam can be used as a substitute for the ordinary drop oGEORGE W. BRIGGS. Witnesses: CHARLES S. WILsoN, J AMES DILTS.

